HKS Super SQV - Top Tier Sequential Blow Off Valve
The Blow Off Valve That Works at Any Boost Level
The HKS Super SQV (Sequential Blow Off Valve) solves one of the most common problems with conventional blow off valves: having to choose between a spring setting that leaks at high boost or one that won't open at low boost. The Super SQV eliminates this compromise entirely through its unique sequential dual valve structure and differential pressure control system, delivering optimal, leak-free blow off operation across the full boost range, from a lightly modified stock turbo to a highly tuned competition setup.
ALSO AVAILABLE AS SUPER SQV IV Black Edition!
How the Sequential System Works
The Super SQV uses a Pull-Type relief valve design with two stages of operation. At low boost, the Primary (small) valve opens instantly when the throttle is lifted, discharging initial boost pressure immediately. As the pressure differential between chambers reaches its maximum, the Primary Valve physically pulls the Secondary (large) valve open, creating a second discharge stage. The result is linear, progressive response at every boost level, with no leaking under high boost and no hesitation at low boost.
Installation Ready
The Super SQV4 is available as a Vehicle Specific Kit, which includes all necessary installation parts, a triple fin, and a recirculation adapter for suction return. or as a Universal Kit for custom installations. The vehicle-specific kit makes fitment straightforward, with everything needed included in the box.
Built to Sound as Good as It Performs
Three fins positioned at the centre of the funnel produce the Super SQV's distinctive, aggressive blow off sound, a detail HKS has engineered as deliberately as the valve mechanics themselves. An optional Round Fin is available separately for sound tuning, and a Black Edition variant is available with a gloss black body, matching upper section, and grainy crystal black funnel for a more understated engine bay appearance.
